Re: [PATCH 2/2] drm/i915: add Ivy Bridge page flip support

[Paul Menzel <paulepanter@users.sourceforge.net>]

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Am Donnerstag, den 16.06.2011, 12:18 -0700 schrieb Jesse Barnes:
> Updated with comment.
> 
> -- 
> Jesse Barnes, Intel Open Source Technology Center
> 
> >From 41bdb7457beb023faa0d465f483ab793ba8896e1 Mon Sep 17 00:00:00 2001
> From: Jesse Barnes <jbarnes@virtuousgeek.org>
> Date: Tue, 14 Jun 2011 11:08:03 -0700
> Subject: [PATCH] drm/i915: add Ivy Bridge page flip support
> 
> Use the blit ring for submitting flips since the render ring doesn't
> generate flip complete interrupts.
> 
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/intel_display.c |   36 ++++++++++++++++++++++++++++++++++
>  1 files changed, 36 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 37e74e9..9446f4e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6412,6 +6412,39 @@ out:
>  	return ret;
>  }
>  
> +/*
> + * On gen7 we currently use the blit ring because (in early silicon at least)
> + * the render ring doesn't give us interrpts for page flip completion, which

inter*u*pts

> + * means clients will hang after the first flip is queued.  Fortunately the
> + * blit ring generates interrupts properly, so use it instead.
> + */

[…]


Thanks,

Paul

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